He said: “Like many in the community, I think the work the hospice does is amazing and it’s vital that they are able to continue.”

The challenge will take place on Friday April 10 and involves a group of 25 starting at Heathrow Terminal 4 station at 5am and finishing in the top-left of the tube map at Amersham at around 11pm.

David, who is originally from London, said: “Most Londoners struggle with their 40 minute commute each morning, so spending over 18 hours on the network will be a challenge.

“But it helps that I’m mad about the tube and have been since I was a kid. I regularly spend days down in London, just travelling around the underground – I love it!”

Geoff Marshall, who currently holds the Guinness World Record for visiting all the stations in the fastest possible time (16 hours 20 minutes 27 seconds), is leading the challenge.

David said: “The aim of the day is for everyone to raise money for their respective charities, have some fun and hopefully complete the challenge – not many people get to do it, so I’m keeping my fingers crossed that there are no signal failures or broken-down trains that day!

“It would be great if readers show their support by making a donation to the hospice.”

You can donate via JustGiving at https://www.justgiving.com/David-Chandler2/

Follow David on Twitter (@dchan52169) to track his progress on April 10.